Biofilm Production and In Vitro Susceptibility to Disinfectants of Staphylococcus Coagulase Positive Isolated from Bovine Milk

Authors

  • Aila Fabiane Peixoto Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Elizabeth Sampaio de Medeiros Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Rinaldo Aparecido Mota Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • José Wilton Pinheiro Júnior Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Karla Danielle Almeida Soares Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Daniel Dias da Silva Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Thayná Milena Siqueira Silva Souza Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Tamyres Izarelly Barbosa da Silva Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.
  • Renato Mesquita Peixoto Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil.

DOI:

https://doi.org/10.22456/1679-9216.97253

Abstract

Background: Mastitis is one of the diseases that cause damage to dairy cattle, and coagulase positive Staphylococcus (CPS), are its main etiological agents. The production of biofilms gives these microorganisms a physiological advantage, being an important virulence factor, as it confers their resistance to the action of disinfectants used in hygiene procedures. Therefore, the objective of this study was to evaluate the capacity of CPS, isolated from milk samples from cases of bovine subclinical mastitis in the Alagoas dairy basin, biofilm production and its sensitivity to disinfectant agents used before and after dipping.

Materials, Methods & Results: In the Alagoas Milk Basin Region, 10 properties were selected from the municipalities of Batalha, Cacimbinhas, Major Isidoro and Minador do Negrão, which used a mechanical milking system and supplied milk to a dairy under federal inspection. The California Mastitis Test (CMT) was performed on 1155 cows. The animals diagnosed with subclinical mastitis were classified as: mild (+); moderate (++) and severe (+++). CMT positive samples were collected from 2+, totaling 891 samples. After cleaning the papillary ostium, 2 to 5 mL of milk was collected from each fourth breast before milking began. Subsequently, 0.5 µL of each sample was streak plated by exhaustion on 5% Sheep Blood Agar and incubated at 37°C, with readings at 24 and 48 h. The macroscopic and microscopic characteristics of the colonies, catalase and coagulase test were evaluated. Biofilm formation was determined by the microplate adhesion test. The efficacy of the sanitizers was evaluated with the active ingredients: lactic acid (2%), allantoin (0.05%), iodine (0.5%), chlorhexidine (2.0%), chlorine (2.5%), at times 15, 30 and 60 seconds. It was observed that 91.2% of the samples were able to form biofilm; Of these, 22.2%, 29.6% and 48.2% were strong, moderate and weak producers, respectively. The sensitivity profile of chlorhexidine isolates was 79.73%, 80.41% and 83.78%; iodine was 59.46%, 65.54% and 66.22% sensitivity over the evaluated time. For allantoin, the isolates presented sensitivity of 22.30%, 27.03% and 37.74%, for lactic acid, 18.92%, 20.95% and 22.30% of the samples were sensitive, and to chlorine, 12.6%, 15.58% and 17.57% of the isolates were sensitive. Moreover, it was observed that the longer the exposure to the disinfectant, the greater the effectiveness of the same.

Discussion: The results are in line with literature data. Staphylococcus spp. from milk samples of animals with subclinical mastitis are able to form biofilm, thus being an important virulence factor. The heterogeneity regarding the biofilm production potential of the isolates is due to the different species of Staphylococcus spp. that, through distinct mechanisms, triggers a greater or lesser formation of this virulent factor, as well as having their adhesion tested, end up becoming more strongly attached to the plate. Among the disinfectants tested, it was confirmed that chlorhexidine and iodine are more effective than SCP, which tend to have high levels of sensitivity to these disinfectants. However, although chlorhexidine was more sensitive to SCP, its use in the field should be done with caution, as its effectiveness may be reduced in the presence of chlorinated water or excess organic matter. It is concluded that SCP isolates from bovine milk from subclinical mastitis mammary quarters were able to produce biofilms. These isolates were also in vitro sensitive to chlorhexidine and iodine, but periodic evaluation of the efficacy of disinfectants used before and after milking is necessary.


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Published

2019-01-01

How to Cite

Peixoto, A. F., de Medeiros, E. S., Mota, R. A., Pinheiro Júnior, J. W., Almeida Soares, K. D., da Silva, D. D., Silva Souza, T. M. S., Barbosa da Silva, T. I., & Peixoto, R. M. (2019). Biofilm Production and In Vitro Susceptibility to Disinfectants of Staphylococcus Coagulase Positive Isolated from Bovine Milk. Acta Scientiae Veterinariae, 47(1). https://doi.org/10.22456/1679-9216.97253

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